Blur background ($0.99): As the name says, quickly blur the background in your photos with different styles, adjustable levels, and even the option to detect cats and dogs.

System Activity Monitors ($0.99): See different stats from your device: RAM & storage usage, battery level, and other information.

Orderly ($0.99): Are you looking for another to-do app? This one offers folders, location-based reminders, cloud or e-mail sync, and backups.

Lottery Box ($5.99): Do you like to bet on the lottery? Organize your favorite combinations and get notified if you win on the Powerball (Mega Millions, Eurojackpot, and other games available as in-app purchases).

With Amazon Prime Trial Temporarily free iOS apps in the Apple App Store Free iOS apps

Stickman Ghost 2: Gun Sword ($0.99): Another action side scroller starring the infamous stickman, this time with a Star-Wars-esque setting and many different weapons.

Dungeon999 ($0.99): Dive into a seemingly endless dungeon collecting items and magic skills to improve your characters.

Trojan War Premium ($0.99): Train your warriors and prepare for battle in different challenges and gameplay modes.

Be the last line of defense and improve your ship to stop hordes of enemies.

Space Shooter ($0.99): Protect the galaxy from the alien invasion.

Shout Screen ($0.99): Similar to the No Chat ( Android | iOS) app my colleague Antoine Engles highlighted on his Apps of the Week column, this app helps you display messages on the phone screen.

Metatag Analyzer ($2.49): Extract the information from webpages and check for errors and possible ways to improve your SEO rankings.

Bookmark Manager ($0.99): Organize your bookmarks away from the browser, with options to export and categorize URLs.

Shot on Watermark on Photo ($1.49): Silly app to fake the photo watermarks from different phone brands.

Net Signal Pro ($0.99) : Check the signal strength for your current Wi-Fi or cellular connection, and learn which access point or operator can offer better speeds, and maybe battery life, for your phone.

With Amazon Prime Trial Temporarily free Android apps on the Google Play Store Free Android apps A good way not to miss out on a short-lived promotion. This way, the app will become part of your app library, and you can install it again for free when you need it.

Quick tip: Have you found an interesting app, but you can't really use it at the moment? Install the app anyway, then delete it from your device.

Google Play Store's limited-time deals on apps are fairly easy to predict, but it's more complicated with App Store deals since Apple doesn't specify how long the discount is valid. Between the publication and the time you view this article, some apps may have become paid again.

This list is updated weekly, with at least two weekly editions, on Tuesday and Friday.

Best free games for mac app store